172986128746 has 4 divisors (see below), whose sum is σ = 259479193122. Its totient is φ = 86493064372.

The previous prime is 172986128723. The next prime is 172986128857. The reversal of 172986128746 is 647821689271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647821689271 = 325189 ⋅1992139.

It can be written as a sum of positive squares in only one way, i.e., 95938248121 + 77047880625 = 309739^2 + 277575^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43246532185 + ... + 43246532188.

Almost surely, 2^172986128746 is an apocalyptic number.

172986128746 is a deficient number, since it is larger than the sum of its proper divisors (86493064376).

172986128746 is an equidigital number, since it uses as much as digits as its factorization.

172986128746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86493064375.

The product of its digits is 16257024, while the sum is 61.

The spelling of 172986128746 in words is "one hundred seventy-two billion, nine hundred eighty-six million, one hundred twenty-eight thousand, seven hundred forty-six".